Transport across cell membrane notes

biology cell membrane notes notability ipad notes osmosis diffusion active transport

If a cell were a house, the plasma membrane would be walls with windows and doors. Moving things in and out of the cell is an important role of the plasma membrane. It controls everything that enters and leaves the cell. There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.

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This is a one-page review of cell transport covering diffusion, osmosis, facilitated diffusion, and active transport. ...

Diffusion is the tendency of molecules to spread into an available space. The diffusion of substances across a membrane is called passive transport.